id:A067519 - OEIS Search Results

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Numbers n such that (n^2+1) is composite and phi(n^2+1)==0 (mod n).

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8, 32, 50, 64, 128, 192, 216, 336, 360, 900, 1000, 1152, 1250, 1280, 1344, 1408, 1800, 2450, 2880, 4096, 5440, 6528, 7564, 9216, 9800, 11008, 12544, 13824, 14450, 14976, 16576, 18432, 20000, 21420, 21440, 24200, 25675, 36000, 36288, 43778, 46656 (list; graph; listen)

	OFFSET	`1,1`
	COMMENT	`If n^2+1 is prime, trivially phi(n^2+1)==0 (mod n)`
	CROSSREFS	`Cf. A066820.` `Sequence in context: A127988 A129749 A005879 this_sequence A009245 A018842 A139098` `Adjacent sequences: A067516 A067517 A067518 this_sequence A067520 A067521 A067522`
	KEYWORD	`nonn`
	AUTHOR	`Benoit Cloitre (benoit7848c(AT)orange.fr), Feb 22 2002`

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Last modified November 25 20:09 EST 2009. Contains 167514 sequences.

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